From a4583fdafc993ea4f0d7218dbcfda862ea79fd7e Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Sat, 14 Sep 2002 19:52:49 +0000
Subject: [PATCH] Fix to work correctly under linux

llvm-svn: 3720
---
 llvm/include/Support/DataTypes.h | 27 ++++++++++++++++++---------
 1 file changed, 18 insertions(+), 9 deletions(-)

diff --git a/llvm/include/Support/DataTypes.h b/llvm/include/Support/DataTypes.h
index 473b5b9f38c4..3d377bebe69d 100644
--- a/llvm/include/Support/DataTypes.h
+++ b/llvm/include/Support/DataTypes.h
@@ -23,20 +23,29 @@
 #include <inttypes.h>
 
 #ifdef __linux__
-# include <endian.h>
+#  include <endian.h>
+#  if BYTE_ORDER == LITTLE_ENDIAN
+#    undef BIG_ENDIAN
+#  else
+#    undef LITTLE_ENDIAN
+#  endif
 #else
-#if (BSD >= 199103)
-# include <machine/endian.h>
-#endif
+#  if (BSD >= 199103)
+#    include <machine/endian.h>
+#  endif
 #endif
 
 #ifdef __sparc__
-#include <sys/types.h>
-#ifdef _LITTLE_ENDIAN
-#define LITTLE_ENDIAN 1
-#else
-#define BIG_ENDIAN 1
+#  include <sys/types.h>
+#  ifdef _LITTLE_ENDIAN
+#    define LITTLE_ENDIAN 1
+#  else
+#    define BIG_ENDIAN 1
+#  endif
 #endif
+
+#if (defined(LITTLE_ENDIAN) && defined(BIG_ENDIAN))
+#error "Cannot define both LITTLE_ENDIAN and BIG_ENDIAN!"
 #endif
 
 #if (!defined(LITTLE_ENDIAN) && !defined(BIG_ENDIAN)) || !defined(INT64_MAX)